Munters HCUw, Operating & Maintenance

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49
3G3JV Maintenance Operations
Chapter7
7
Fault
display
Fault name and meaning Probable cause and remedy
oL1 Motor overload
(OL1)
The electric thermal relay
actuated the motor overload
protective function.
•
The load is excessive.
~
Reduce the load.
~
Decrease the Inverter capacity.
•
The V/f setting is incorrect.
->
Reduce the V/f set voltage.
•
The value in n11 for maximum voltage frequency is low.
->
Check the motor nameplate and set n11 to the rated
frequency.
•
The acceleration/deceleration time is too short.
->
Increase the acceleration/deceleration time.
•
The value in n32 for rated motor current is incorrect.
~
Check the motor nameplate and set n32 to the rated
current.
•
The Inverter is driving more than one motor.
~
Disable the motor overload detection function and install
an electronic thermal relay for each of the motors.
The motor overload detection function is disabled by
setting n32 to 0.0 or n33 to 2.
•
The motor protective time setting in n34 is short.
->
Set n34 to 8 (the default value).
oL2 Inverter overload
(OL2)
The electronic thermal relay
has actuated the Inverter
overload protective function.
•
The load is excessive.
->
Reduce the load.
•
The V/f setting is incorrect.
->
Reduce the V/f set voltage.
•
The acceleration/deceleration time is too short.
->
Increase the acceleration/deceleration time.
•
The Inverter capacity is
insufficient.
->
Use an Inverter model with a higher capacity.
oL3 Overtorque detection
(OL3)
There has been a current or
torque the same as or greater
than the setting in n60 for
overtorque detection level and
that in n61 for overtorque
detection time. A fault has
been detected with n59 for
overtorque detection function
l i 2 4
•
The mechanical system is locked or has a failure.
~
Check the mechanical system and correct the cause of
overtorque.
•
The parameter settings were incorrect.
~
Adjust the n60 and n61 parameters according to the
mechanical system.
Increase the set values in n60 and n61.
GF Ground fault (GF)
The ground fault current at the
output of the Inverter has
exceeded the rated output
current of the Inverter.
•
A ground fault has occurred at the Inverter output.
~
Check the connections between the Inverter and motor
and reset the fault
after
correcting its cause.